I would just go with the new on that one i believe, there is always those opp's and o-no's any human makes that could raise the price considerable... @ 25 buck's more i would like the new stuff. Do they have any warranty on the rebuild, or a warranty on the new?

The emery paper/super glue approach works.
Smooth the shaft down with emery paper. If you've done it right, where the rust was will be little divets.
Now, wipe it clean. Wipe super glue over the entire shaft and yes it will run everywhere. LET IT CURE.
Take some more emery paper and smooth the cured super glue down. You will have a shaft that is smooth now and the seal will not get nicked.